Tranexamic acid in treatment-resistant chronic transfusion-dependent gastrointestinal angiodysplasia bleeding

Tranexamic acid may be a useful pharmacotherapy for endoscopically resistant small bowel angiodysplasia

Small bowel angiodysplasia (SBAD) is reported to account for nearly 50% of cases of small bowel bleeding. When SBAD occurs frequently, it is difficult to treat all the angiodysplasias endoscopically, and gastrointestinal bleeding often recurs. Hormone therapy, somatostatin analogs, thalidomide and vascular endothelial growth factor (VEGF)-neutralizing antibodies have been reported to reduce gastrointestinal angiodysplasia (GIAD) bleeding. However, there is no strong evidence to recommend them. Also, there are no guidelines for their use. Hereditary hemorrhagic telangiectasia (HHT) is a hereditary disease caused by abnormalities in VEGF, resulting in multiple GIADs. A treatment guideline has been created for GIAD in HHT, and the use of tranexamic acid, an antifibrinolytic agent, is the first recommendation pharmacotherapy for GIAD with gastrointestinal bleeding that is difficult to treat endoscopically. It has been reported that fibrinolysis is accelerated in GIAD patients who are not HHT, similar to HHT patients. The use of tranexamic acid for gastric antral vascular ectasia in GIAD has been reported to be useful. However, there are very few reports of its use for SBAD. There are concerns with tranexamic acid use regarding the development of thrombosis/embolism, but there are few reports of such side effects. Future clinical trials including tranexamic acid for SBAD are desired.

Thalidomide for refractory gastrointestinal bleeding from vascular malformations in patients with significant comorbidities

BACKGROUND

Refractory gastrointestinal bleeding (GIB) secondary to gastrointestinal vascular malformations (GIVM) such as gastrointestinal angiodysplasia (GIAD) and gastric antral vascular ectasia (GAVE) remains challenging to treat when endoscopic therapy fails. Recently thalidomide has been suggested as a treatment option for refractory GIB.

AIM

To determine the outcome of patients treated with thalidomide for refractory GIB due to GIVM.

METHODS

IRB approved, single center, retrospective review of electronic medical records from January 2012 to November 2018. Patients age > 18 years old, who had > 3 episodes of GIB refractory to medical or endoscopic therapy, and who had been treated with thalidomide for at least 3 mo were included. The primary endpoint was recurrence of GIB 6 mo after initiation of thalidomide.

RESULTS

Fifteen patients were included in the study, all with significant cardiac, hepatic, or renal comorbidities. The cause of GIB was GIAD in 10 patients and GAVE in 5 patients. Two patients were lost to follow up. Of the 13 patients followed, 38.5% (n = 5) had no recurrent GIB or transfusion requirement after treatment with thalidomide. Furthermore, 84.6% (n = 11) of patients had a reduction in transfusion requirements and hospitalizations for GIB. Thalidomide was discontinued in 2 patients due to cost (n = 1) and medication interaction (n = 1). Reported adverse reactions included fatigue (n = 3), neuropathy (n = 2), dizziness (n = 1), and constipation (n = 1). Six patients died during follow up due to unknown cause (n = 4) and sepsis (n = 2).

CONCLUSION

Thalidomide appears to be an effective treatment for refractory GIB due to GIAD or GAVE in a Western population with significant comorbidities.

An overview of angiodysplasia: management and patient prospects

Gastrointestinal angiodysplasias (GIADs) have a wide variety of presentations, which can be significant and debilitating in a subset of patients. Endoscopic ablation is currently the most effective treatment for GIADs, however re-bleeding rates are high. Several medical have been used for GIADs and reported in the literature, however these medications have significant side effect profiles and randomized controlled trials are lacking. A relatively poor understanding of the pathophysiology of GIAD formation has limited the development of more effective treatments and improved diagnostic and prognostic markers for GIAD. However, recent advances in research in the area of angiogenesis have identified a potential role for certain angiogenic factors including Angiopoeitin 1 and 2, in the pathophysiology of GIAD. Areas covered: We performed an extensive pubmed search of all articles mentioning GIAD and summarized our findings focussing on patient management and prospects. We summarize the available literature regarding the medical, endoscopic, and radiological management of GIAD and the value of clinical prognostic factors. Expert commentary: Although the area of angiogenesis is a novel area of research in GIAD, it represents an exciting avenue for development with the potential to improve diagnostic and prognostic tools to improve patient outcome.